I've just replied to a very similar thead on this!

Mine went exactly like this (not my video by the way)

http://www.youtube.com/watch?v=ATjdVu1Ff-Q

Prior to me swapping the rack out I changed the lower arms, droplinks and track rod ends with no difference.

In the end I resorted to changing the rack and used an exchange rack from Eurocarparts. I've done almost 10k since with no issues.

A few shots of the rack change... (any questions, just ask)